300/440/550 Flooding when sitting in sun

J

johnboy

Kawasaki 650sx dual SBN 44's duel feed from the tank and a one way valve on the tank to vent air in only. If I fill the tank the night before and trailer it to the beach next day it's total flooded. Pull the plugs and crank and gas goes flying. Install plugs get it stared and blow out all kinds of gas in the water bax. If I uncrew the gas cap the is a lot of prssure in there so I'm thinking it's building pressure from the florida heat and forcing gas trough the carbs flooding the engine. Ski runs fine all day after I get it cleaned out and release that pressure in the tank.

Should I leave the gas cap cracked a little to stop the pressure and tighten it up before I ride or can I remove the oneway valve or even poke a small hole int to relieve pressure with temp changes. I have not flipped my ski upsidedown in 3 years. Have had some pretty bad injuries but 100% this year

Thanks, John S
 
Papnschmilees

Papnschmilees

Berinnn dinn dinn
Location
Seneca Creek, MD
to my understanding the pressure that builds up from the sun should not be able to push fuel into the motor. I think the needle and seat part of the carb should be stopping that from happening.

Is this a new ski for you? if not did you experience this problem at all last season?
 
J

johnboy

Motor runs perfect so I'm ot tearing into the carbs to test the pop-off. I solved it by slightly loosening the tank fill when storing it. Tighten it before I head to the beach and it starts first crank everytime now. I'm sure I will be rebuilding these carbs down the road but don't want to tear them down when they run great. I'm sure the pop-off spring is very light in these carbs
 
ADDict

ADDict

It's really nothing to do.. Takes a couple minutes per carb, and you don't have to pull it apart what so ever to check. Just search pop off and you'll see what I'm mean.
If your pop off is too low it will have a negative impact on your throttle response too, just a thought.
 
J

johnboy

X2Addict said:
It's really nothing to do.. Takes a couple minutes per carb, and you don't have to pull it apart what so ever to check. Just search pop off and you'll see what I'm mean.
If your pop off is too low it will have a negative impact on your throttle response too, just a thought.
Click to expand...

I've done a few carbs in my time and will get into these if I have any throttle response issues. Doesn't a lot of pressure in your fuel tank throw your tunning off anyways?? Make it run fat by forcing fuel into the pump diaphrams...therefore blowing the pop-off sooner then it should.

I'm 100% sure on of the needles has a very small leak, that's the only way gas could have gotten in the cylinders when it sits for a week or two...
 
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